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Body Shape and Orientation Control for Locomotion of Biologically-Inspired Snake Robots

Rezapour, Ehsan; Pettersen, Kristin Ytterstad; Gravdahl, Jan Tommy; Liljebäck, Pål
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URI
http://hdl.handle.net/11250/2468579
Date
2014
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Original version
Biomedical Robotics and Biomechatronics (2014 5th IEEE RAS & EMBS International Conference on), 2014, 993-1000  
Abstract
This paper considers guidance-based motion control of planar snake robots using a dynamic feedback control law. We first present the Euler-Lagrange equations of motion of the robot. Subsequently, we introduce a dynamic feedback control law for the joints of the robot to track a desired gait pattern. This tracking control law depends on the time evolution of the state variables of a dynamic compensator which is used for controlling the orientation of the robot. In particular, we employ the dynamic compensator to practically stabilize a reference head angle defined by a Line-of-Sight path following guidance law. Using an input-output stability analysis, we show the uniform boundedness of the solutions of the controlled system. Furthermore, we use a perturbation analysis to show that the orientation error is ultimately bounded by an arbitrarily small bound. Simulation results are presented to validate the theoretical results.

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